Electrical & Solar calculators

Size a standby or portable generator. Add up running watts, add the largest motor starting surge, and get the generator wattage and daily fuel use.

Size a solar array from your power bill. Enter monthly kWh, peak sun hours, and panel wattage to get system kW, panel count, and roof area needed.

Calculate voltage drop on copper or aluminum wire, single or three phase. Get volts lost, percent drop, voltage at the load, and the max run at 3%.

Find the wire gauge a circuit needs. Enter amps, copper or aluminum, run length, and voltage to get an AWG size, its ampacity, and voltage drop.